Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4NIO callsign genealogy
Currently held by HOLCOMB, WILLIAM H
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K4NIO's current licensee, walking backwards.
- HOLCOMB, WILLIAM HFLgranted 1996-08-14cancelled 2000-06-09
Successor callsigns
Callsigns held now by people who previously held K4NIO.
- HOLCOMB, WILLIAM HFLgranted 2009-09-29cancelled 2021-09-30